/*******************************************************************************
 * Copyright (c) 2012-2016 Codenvy, S.A.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.ide.ext.java.client.action;

import com.google.common.base.Optional;
import com.google.inject.Inject;
import com.google.inject.Singleton;

import org.eclipse.che.ide.api.action.ActionEvent;
import org.eclipse.che.ide.api.action.ProjectAction;
import org.eclipse.che.ide.api.app.AppContext;
import org.eclipse.che.ide.api.resources.Container;
import org.eclipse.che.ide.api.resources.Project;
import org.eclipse.che.ide.api.resources.Resource;
import org.eclipse.che.ide.ext.java.client.JavaLocalizationConstant;
import org.eclipse.che.ide.ext.java.client.JavaResources;
import org.eclipse.che.ide.ext.java.client.newsourcefile.NewJavaSourceFilePresenter;

import static com.google.common.base.Preconditions.checkState;
import static org.eclipse.che.ide.ext.java.client.resource.SourceFolderMarker.ID;
import static org.eclipse.che.ide.ext.java.client.util.JavaUtil.isJavaProject;

/**
 * Action to create new Java source file.
 *
 * @author Artem Zatsarynnyi
 */
@Singleton
public class NewJavaSourceFileAction extends ProjectAction {


    private final AppContext                 appContext;
    private       NewJavaSourceFilePresenter newJavaSourceFilePresenter;

    @Inject
    public NewJavaSourceFileAction(NewJavaSourceFilePresenter newJavaSourceFilePresenter,
                                   JavaLocalizationConstant constant,
                                   JavaResources resources,
                                   AppContext appContext) {
        super(constant.actionNewClassTitle(), constant.actionNewClassDescription(), resources.javaFile());
        this.newJavaSourceFilePresenter = newJavaSourceFilePresenter;
        this.appContext = appContext;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        final Resource[] resources = appContext.getResources();
        final boolean inJavaProject = resources != null && resources.length == 1 && isJavaProject(resources[0].getRelatedProject().get());

        checkState(inJavaProject && resources[0].getParentWithMarker(ID).isPresent());

        final Resource resource = resources[0];

        if (resource instanceof Container) {
            newJavaSourceFilePresenter.showDialog((Container)resource);
        } else {
            final Optional<Container> parent = resource.getParent();
            if (parent.isPresent()) {
                newJavaSourceFilePresenter.showDialog(parent.get());
            } else {
                throw new IllegalStateException("Failed to get parent container");
            }
        }

    }

    @Override
    public void updateProjectAction(ActionEvent e) {
        final Resource resource = appContext.getResource();
        if (resource == null) {
            e.getPresentation().setEnabledAndVisible(false);
            return;
        }

        final Optional<Project> project = resource.getRelatedProject();
        if (!project.isPresent()) {
            e.getPresentation().setEnabledAndVisible(false);
            return;
        }

        e.getPresentation().setEnabledAndVisible(isJavaProject(project.get()) && resource.getParentWithMarker(ID).isPresent());
    }
}
